Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 22, Problem 3ASA
What are equipotentials, and how are they experimentally determined? What is their relationship to the electric field lines?
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Chapter 22 Solutions
Physics Laboratory Experiments
Ch. 22 - Prob. 1ASACh. 22 - What are lines of force, and what force is it?Ch. 22 - What are equipotentials, and how are they...Ch. 22 - What is a magnetic field, how is it defined, and...Ch. 22 - Does the magnetic field B S have the same...Ch. 22 - How may a magnetic pole be moved in a magnetic...Ch. 22 - Directions of the fields are indicated on field...Ch. 22 - Comment on the electric field of the parallel...Ch. 22 - Sketch the electric field for (a) a negative point...Ch. 22 - Compare the electric fields and magnetic fields of...
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- In Franklins time, a device for storing electric potential energy was called a Leyden jar. Today, we call that device a capacitor. Another term that is sometimes used is condenser. What ideas do these three terms bring to mind? What are the advantages and disadvantages of each?arrow_forwardExplain in your own words why equipotential lines and surfaces must be perpendicular to electric field lines.arrow_forwardUse the characteristics of the of the Coulomb force to explain why capacitance should be proportional to the plate area of a capacitor. Similarly, explain why capacitance should be inversely proportional to the separation between plates.arrow_forward
- A supermarket sells rolls of aluminum foil, plastic wrap, and waxed paper. (a) Describe a capacitor made from such materials. Compute order-of-magnitude estimates for (b) its capacitance and (c) its breakdown voltage.arrow_forwardCan different equipotential lines cross? Explain.arrow_forwardWill a negative charge, initially at rest, move toward higher or lower potential? Explain why.arrow_forward
- A simple and common technique for accelerating electrons is shown in Figure 18.55, where there is a uniform electric field between two plates. Electrons are released, usually from a hot filament, near the negative plate, and there is a small hole in the positive plate that allows the electrons to continue moving. (a) Calculate the acceleration of the electorn if the field strength is 2.50104 N/C. (b) Explain why the electron will not be pulled back to the positive plate once it moves through the hole.arrow_forwardThe lesser electric ray (Narcine bancroftii) maintains an incredible charge on its head and a charge equal in magnitude but opposite in sign on its tail (Figure 19.32). (a) Sketch the equipotential lines surrounding the ray. (b) Sketch the equipotentials when the ray is near a ship with a conducting surface. (C) How could this charge distribution be of use to the ray? Figure 19.32 Lesser electric ray (Narcine bancroftii) (credit: National Oceanic and Atmospheric Administration, NOAAs Fisheries Collection).arrow_forwardA constant electric field accelerates a proton from rest through a distance of 2.00 m to a speed of 1.50 105 m/s. (a) Find the change in the protons kinetic energy. (b) Find the change in the systems electric potential energy. (c) Calculate the magnitude of the electric field.arrow_forward
- Describe the motion of a proton (a) after it is released from rest in a uniform electric field. Describe the changes (if any) in (b) its kinetic energy and (c) the electric potential energy of the proton-field system.arrow_forwardAbout what magnitude of potential is used to charge the drum of a photocopy machine? A web search for “xerography” may be of use.arrow_forwardElectric charge can accumulate on an airplane in flight. You may have observed needle-shaped metal extensions on the wing tips and tail of an airplane. Their purpose is to allow charge to leak off before much of it accumulates. The electric field around the needle is much larger than the field around the body of the airplane and can become large enough to produce dielectric breakdown of the air, discharging the airplane. To model this process, assume two charged spherical conductors are connected by a long conducting wire and a 1.20-C charge is placed on the combination. One sphere, representing the body of the airplane, has a radius of 6.00 cm; the other, representing the tip of the needle, has a radius of 2.00 cm. (a) What is the electric potential of each sphere? (b) What is the electric field at the surface of each sphere?arrow_forward
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